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Good morning! I'd be happy to give you a little more information on this. Any time there is decay, you should proceed with treatment as soon as possible because we know that decay progresses over time.
Wisdom teeth are at a higher risk for decay because of their location in the mouth. This is probably why you have developed a cavity there when the rest of your mouth is healthy.
You do not have to be sedated for the extraction, and upper wisdom teeth are typically very easy to extract. This means it should not be a traumatic visit for you. I would discuss your anxiety issues with your dentist to determine what is the best course of action for you. Maybe a low dose of laughing gas would be enough to relax you during the procedure, and you would maintain consciousness.
Does that answer your question?
You're welcome. I am happy to help. Do you have any other questions for me?